Yea i tried the -
Empty old r12 from system
Add pag oil
Add r134a...
Didn't work for me, but then again I probably did something wrong haha. The cold master kit comes with everything you need to add ac I believe, it also comes with a sanden compressor, all for 500ish.
I also have my stock ac brackets, if those don't work I'm pretty sure I have a couple zip ties left in the tool box. :poke::D